I spent my first five years in IT trying to be the person who knew everything. I'd jump from networking to databases to security certifications, chasing whatever seemed most in demand. I ended up with a stack of paper that looked impressive but a gut feeling that I hadn't actually solved anything meaningful for anyone.
Then I worked with a senior architect who changed my thinking. He was okay at a lot of things — could script in Python, understood firewalls, had opinions on storage — but where he truly shined was in understanding how data moved through an enterprise. He could trace a transaction from a barcode scanner on a factory floor through five middleware layers and into an ERP system, and tell you exactly where latency would bite you. That depth made his breadth useful.
That's the T-shaped engineer. The vertical stroke is your deep expertise in one area. The horizontal bar is your ability to work across disciplines. Without the depth, you're just a generalist who can talk about anything but solve nothing. Without the breadth, you're the expert who builds a perfect solution for a problem nobody else understands.
I learned this the hard way during a migration project. Our team had a brilliant storage specialist who could configure SANs in his sleep. He designed an elegant solution for the database servers. But he never talked to the network team, so the replication traffic ran over the same switch as the user-facing application. Performance tanked. The fix took weeks and cost the client a lot of money. That specialist had depth but no breadth — he didn't understand how his piece connected to the whole.
On the flip side, I've seen jacks-of-all-trades who can set up a server, configure a firewall, and write a basic SQL query, but when something breaks in their domain of supposed expertise, they flail. They lack the deep understanding to diagnose the root cause. They swap parts until something works. That's not engineering, that's guessing.
The real skill is knowing when to lean on your depth and when to rely on your breadth. When I'm architecting a cloud migration for a manufacturer, I spend most of my time on the networking and security implications — that's my depth. But I also need to understand their production scheduling system, their IoT sensors, their compliance requirements. I don't need to be an expert in those, but I need to know enough to ask the right questions and spot when something doesn't add up.
Early in my career, I thought breadth was a shortcut to being valuable. Now I see it as the foundation that makes your depth accessible. The best consultants I know have one thing they can do better than almost anyone, and a dozen things they can do well enough to be dangerous. That combination is what lets you walk into a room full of specialists and actually move a project forward.
What's your one thing? Not what you're certified in, but what problem do you solve that makes people call you specifically?